Steven Pinker claims in his new book that far from being the bloodiest era in human history, ours is a time when violence has been in steep decline. Here, he explains how mankind turned its back on brutalitySteven Pinker is one of those wunderkinder that elite US universities seem to specialise in producing. Born in Canada in 1954, he's currently a professor of psychology at Harvard, but ever since he arrived in Cambridge, Massachusetts in 1976 he's been bouncing like a high-IQ tennis ball between Harvard and its prestigious neighbour, MIT (he has professorial chairs at both institutions). By profession he's an experimental psychologist who began doing research on visual cognition but eventually moved into studying language, especially language acquisition in children. He probably knows mo...

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